Question

C) Shin thinks of a number. She multiplies it bye 5 then subtract 7. The answer is he

same as 3 times a number plus 11. What number did shin think of?

Answer 1

9

Explanation:

let the number be y

5×y - 7 = 3×y + 11

5y-7 = 3y+11

collect like terms

5y-3y = 11+7

2y = 18

y = 18/2

y = 9